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Clip the invalidation example. #929

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Clip the invalidation example. #929

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7 changes: 6 additions & 1 deletion druid/examples/invalidation.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -79,7 +79,12 @@ impl Widget<Point> for CircleView {

fn paint(&mut self, ctx: &mut PaintCtx, data: &Point, _env: &Env) {
ctx.with_save(|ctx| {
let rect = ctx.size().to_rect();
let rect = ctx.region().to_rect();
// Clip to the rect that was invalidated. This is usually not
// necessary, but if there's lots of drawing involved then there's a
// chance that clipping can be faster. Also, drawing outside the
// invalid region has backend-dependent behavior: for example, it
// has no effect on GTK but it does have an effect on wasm.
ctx.clip(rect);
ctx.fill(rect, &Color::WHITE);
ctx.fill(Circle::new(*data, RADIUS), &Color::BLACK);
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